Influence of pore characteristics and surface properties on fouling behavior of Membrane bioreactor

• Main Author: Chutipas Narkkrasae
• Other Authors: Shih-Hsiung Chen
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/45705970196748878786

碩士 === 嘉南藥理大學 === 環境工程與科學系 === 102 === Membrane fouling problem is evident as a rise in the required transmembrane pressure (TMP) and declined the permeation flux. The mainly dominated factors can be mainly contributed to the pore properties and membrane surface’s properties. In this investigation we describe the pore properties with different porosity of polysulfone and polysulfone/polyether imide membranes. The membrane surface properties were correlated to the composition of membrane with polysulfone and polyether imide. Finally the operation conditions of MBR systems were also discussed in this study. It can be seen that the pore formation agent (Poly (ethylene glycol) (PEG)) content in the casting solution dominated the porosity of polysulfone membrane and PSF/PEI membrane. The optimum PEG content not only obtained a good permeation property but also achieved a high selectivity of membranes during the MBR process. A over 95% turbidity removal and over 50 L/m2hr permeation rate can be achieved for the polysulfone membrane. The fouling material on the surface of polysulfone was observed by the SEM and the element analyses were carried out by the EDS measurements. On the other hand, the effect of hydrophilicity on the fouling behavior of composite membrane had also investigated in this study. Based on the water contact angle measurements, it was found that the increase in PEI content declined the contact angle of composite membranes. The hydrophilicity increases of membrane benefited the antifouling behavior during the MBR process. It can be found that low permeation and higher selectivity can be achieved in the higher PEI content membranes. The back-wash test also confirmed the antifoulingbehavior which contributing by the hydrophilic material content in the composite membranes. Finally, we also present the dominating factors of fouling behavior on the MBR surfaces. Experimental observations are provided in supporting propose foulingmechanisms and some suggestion for MBR operation was recommended.